Dell 2135cn Color Laser Printer - Manual (Page 256)

Loading Envelopes
Use the following guidelines when loading envelopes in the tray 1:
Envelope#10
Load the envelopes short edge feed with the flaps closed and the print side up. Ensure that the flaps come at the right when you face towards the printer.
Monarch or DL
The Monarch or DL envelopes can be loaded in one of the following ways:
Load the envelopes short edge feed with the flaps closed and the print side up. Ensure that the flaps come at the right when you face towards the printer.
OR
Load the envelopes long edge feed with the flaps open and the print side up. Ensure that the flaps come at the top when you face towards the printer.
Tray 1
Face up
Letterhead enters the printer last
Single sheet feeder
Face down
Letterhead enters the printer first
NOTE: If you do not load envelopes in the tray 1 right after they have been removed from the packaging, they may bulge. To avoid jams, flatten them
as shown below before loading them in the tray 1.